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Hi everyone!

I wonder if you could please help decide which would be my next OTA!
I recently upgraded my Celestron Nexstar 6SE mount to a Celestron CGEM mount. I´ve been doing some planetary work with the old Nexstar 6SE, but now my main goal now is DSO. You can see some of my work in my blog: www.astrofotoperu.com

One of the main problems with the alt-az mount was that long exposures were impossible. My personal record was 30 seconds, but from 100 shots, only 15 where usable. 

I know the CGEM mount will help a lot on doing DSO, and that depending on the OTA I choose, I would probably need an autoguider.
The focal length range I´m looking for should be around 600 mm and 800 mm.

My main camera will be a Sony a7s (unmodded) which is a full frame cam, but I´ve read that most scopes won´t take full advantage over a full frame sensor, and will only reach an APSC frame size.

So,

Are there any 600 mm to 800 mm OTA´s out there, that can help me use the full frame sensor? I must say that I would love a refractor, but I´m open to other choices... :D

Thanks!

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